US2096982A - Deflecting voltage generator, more particularly for television receivers - Google Patents

Deflecting voltage generator, more particularly for television receivers Download PDF

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Publication number
US2096982A
US2096982A US686494D US68649433D US2096982A US 2096982 A US2096982 A US 2096982A US 686494 D US686494 D US 686494D US 68649433 D US68649433 D US 68649433D US 2096982 A US2096982 A US 2096982A
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United States
Prior art keywords
condenser
voltage
resistance
charging
grid
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Expired - Lifetime
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US686494D
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English (en)
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Schlesinger Kurt
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Individual
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Individual
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
    • H03K6/02—Amplifying pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/86—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements gas-filled tubes or spark-gaps
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/92—Generating pulses having essentially a finite slope or stepped portions having a waveform comprising a portion of a sinusoid

Definitions

  • one object of the invention is v a suitable arrangement and dimensioning of the 26' ments is such that the natural curvature of the charging characteristic of a condenser being ciharged by an ohmic resistance is kept ineflec-' t ve,
  • That preferably means are provided to decrease retroactions of the load (the consumer) on the deflecting voltages.
  • Another object of the invention at) is to provide means for obtaining the necessary deflecting voltage amplitudes with a reasonable voltage supply.
  • the natural curvature of the charging tuneas tion of a condenser being charged through a resistance may to a certain degree be corrected by connecting a choke in series with said resistance or by even altogether replacing said resistance by a'more complicated network.
  • means are provided for obtaining variation of the frequency of the deflecting voltages not only to any desired value, but also in a quasi automatic way to certain preferred frequencies.
  • I is the D. C. voltage supply, shown by way of example as a battery, which, though, may
  • the D. C. voltage turnished by the device I is applied through the.
  • Such a stabilizer voltages may be obtained which are constant within a few tenths per cent, and the constancy may be still improved by means of 15 connections known per se, for instance by the use of two'stabflizers.
  • the voltage between two' electrodes of the stabilizer is utilized for charging the maincondenser 9 of the deflecting volt-' age generator, a further glow lamp I 0 serving 20 for the periodic discharge of the condenser 9 by becoming conductive as soon as the condenser is charged up to its ignition voltage.
  • the charging of the condenser 9 takes place through an ohmic resistance I, which may be variable for 25 the purpose of frequency adjustment, and may, according to the invention, be furnished with a plurality of marked tapping points whereby certain preferred frequencies (for instance 60, and lines per image in the case of the gen- 3( erator being devised for generating line deflection voltages) may be obtained in an as it were quasi automatic way.
  • the condenser 9 may be 9 is charged through a.
  • the time constant of the charging circuit determined by the values of the charging condenser and the resistance connectedin series therewith, 5 must be chosen to be considerably greater than the period of the relaxation oscillations to be generated, for instance 10-100 times this period.
  • the useful voltage is even-reduced to one 5 fiftieth of the available voltage.
  • the arrangement is so devised that a voltage of 30 volts between the poles of the condenser 9 is sufficient, as will be explained below, and as a deviation of the charging function from linearity amounting to practically causes no disturbing effects, the available voltage is to be chosen at about 300 volts.
  • connection systems of this sort By using connection systems of this sort, the useful fraction of the available voltage may be increased, so that in the case that, moreover, a voltage of say 500-1000 volts is available, special means for causing the apparatus to work with small maximum condenser charges, may be dispensed'with.
  • the glow discharge device I it is preferably represented by a gas filled grid controlled thermionic valve.
  • the maximum condenser voltage admitted by this glow lamp then regulates itself in a simple way by the grid bias of the glow lamp.
  • This negative bias may be taken from two electrodes terminating apart of the total discharge space of the stabilizer 3, as this bias is an essential factor in determining the fre-- quency of the periodic discharges, and consequently should be very constant, too.
  • the said bias may be obtained by connecting the cathode of the glow tube Hi to an intermediate electrode of the stabilizer 3, and by connecting the cathode of the stabilizer 3 through a high value grid leak resistance 22 to the grid of the glow tube Ill.
  • the synchronizing signals are fed in by the terminal l9 and are applied to the grid of the glow tube "I through a blocking condenser 20 and a series resistance 2
  • the oscillating voltages of the condenser 3 are coupled by means of a; condenser l4 and a potentiometer l3 having a very high resistance so as to reduce the load to the condenser .8 to am amplifier valve 23. acting at the. same time as a voltage amplifier and as a power amplifier.
  • resistance 13 and the natural capacities of the amplifier grid circuit should be, in a manner well known in the art, so adjusted as to obtain frequency independency, so that amplification takes -place without distortion of the wave form of the terminals P1 and P2, from exerting a detrimental retroaction on the deflecting voltages.
  • the combination of both of the mentioned functions of the valve 23 is satisfactorily succeeded in by the use of a pentode.
  • the control grid bias of the valve 23 may be taken from a potentiometer I5, which may be connected across a partial discharge space of the stabilizer 3.
  • the bias of the screen grid of the valve 23, applied to said grid through a series resistor l1 shunted by a by-pass condenser I8, is so chosen as to allow adjustment of the correct working point on the control-grid voltage-plate current characteristic, though the control grid bev biased relatively far into the negative.
  • the resulting amplitude, and consequently the size of the line screen produced by the cathode ray deflection is adjusted by means of a variable tap on the potentiometer l3.
  • the position of the whole line screen may be varied by adjusting a tap on the grid bias potentiometer I5, whereby the internal resistance of the valve 23 is varied asdesired and consequently the equilibrium of the bridge formed by the valve 23 and its anode resistance on the one hand, two parts of the total discharge space of the stabilizer '3 on the other hand.
  • a second circuit For producing those voltages necessary for deflecting the cathode ray in a direction vertical to the deflection caused bythe voltages produced in the shown device, a second circuit is employed, which resembles that shown but for the dimensioning of its elements (the ratio between the frequencies of the voltages to be generated in the two circuits in question being equal to the num ber of lines the line screen is to be composed of-for instance equal to 60 or 90 or 120), and which is preferably fed from the same stabilizer 3 through connections as indicated by arrows on the top of the drawing.
  • the dimensioning of the circuit elements an essential requirement is that the time constants of the charging circuits are from ten to one hundred times greater than the periods of the oscillations to be generated in the respective circuits.
  • the essential elements of the frame frequency deflecting circuit may, for example, be chosen as follows:
  • Condenser 9 from '7 to 10 mf. (the corresponding condenser in the line frequency deflecting circuit being in the order of 0,1 mf.)
  • Potentiometer l3 preferably not below 1 megohm.
  • valve 23 Because of the high value of I3 the grid lead connection of the valve 23 should be as short as possible and carefully screened off against any capacitative disturbances.
  • the valve 23 may be so chosen as to enable an amplification in the order of 10-15 times to be obtained.
  • the heating of the cathodes throughout the apparatus may, without any difllculties, be supplied from the A. C. mains.
  • I claini An arrangement for producing oscillations of saw tooth wave form, comprising a direct current source. having fluctuations in potential, a
  • glow discharge device electrodes in said glow dischargedevice, means to cause said glow discharge device to be energized from said direct current source-means to take from said electrodes potentials steadied as compared with the potential ofsaid direct. current source by the working of said glow discharge device, an adjustable condenser and a resistance connected in series, means for applying a voltage taken from a pair of said electrodes to said series connection .to charge said condenser, means for periodically discharging said condenser.
  • said discharging means including a second glow discharge device connected across said condenser, said discharging means being so dimensioned in relation to the dimensioning of said condenser and of said series connection and-in relation to the voltage available between said pair of electrodes as to allow said condenser to be charged to at most one tenth of said voltage only before the discharge 5

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
US686494D 1932-08-30 1933-08-24 Deflecting voltage generator, more particularly for television receivers Expired - Lifetime US2096982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE424429X 1932-08-30

Publications (1)

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US2096982A true US2096982A (en) 1937-10-26

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US686494D Expired - Lifetime US2096982A (en) 1932-08-30 1933-08-24 Deflecting voltage generator, more particularly for television receivers

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US (1) US2096982A (fr)
FR (1) FR760108A (fr)
GB (1) GB424429A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422231A (en) * 1944-12-06 1947-06-17 Union Switch & Signal Co Pulse generating receiver for coded carrier signals
US2426179A (en) * 1942-06-19 1947-08-26 Int Standard Electric Corp Electrical relaxation oscillator
US2671858A (en) * 1946-04-03 1954-03-09 Fong Arthur Linear sweep generator
US2845579A (en) * 1955-01-19 1958-07-29 Bendix Aviat Corp Frequency meter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE407565A (fr) * 1934-03-17
NL62083C (fr) * 1936-02-04

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426179A (en) * 1942-06-19 1947-08-26 Int Standard Electric Corp Electrical relaxation oscillator
US2422231A (en) * 1944-12-06 1947-06-17 Union Switch & Signal Co Pulse generating receiver for coded carrier signals
US2671858A (en) * 1946-04-03 1954-03-09 Fong Arthur Linear sweep generator
US2845579A (en) * 1955-01-19 1958-07-29 Bendix Aviat Corp Frequency meter

Also Published As

Publication number Publication date
FR760108A (fr) 1934-02-16
GB424429A (en) 1935-02-21

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